Botaby disk bit



Dec. 10, 1929. v. J. KUBIN ETAL ROTARY DISK BIT Original Filed July "7. 1925 Array/or: 1 0 I K051}; and H rry fi/rdera x- "4 M f/Iw'r 4/f0 r/7ey Reissued Dec. 10, 1929 UNITED STATES PATENT OFFICE VAN J. RUBIN, OF TORBANCE, AND

PERRY FUNDERBUBK, 0F HUNTINGTON BEACH, CALIFORNIA ROTARY DISK BIT Original No. 1,599,094, dated September 7, 1926, Serial No. 42,042, filed July 7, 1925. Application for reissue filed September 17,

,A further object of the invention is to pro- 7 vide a rotary drill bit with double edge outters arranged so that one edge of each cutter acts on or cuts the bottom of the hole while the other edge cuts or reams the side of the "hole.

Other objects, features and advantages of the present invention will appear hereinafter and from consideration of the drawings.

The invention is illustrated in the annexed drawings in which Figure l is a side elevation of the bit; Figure 2 is a bottom plan View thereof; Figure 3 is a cross section through one of the cutters showing its mannor of mounting, being a View taken on line 3-3 on Figure 1.

Corresponding reference characters designate corresponding parts in all of the figures. The bit comprises, generally, a stem 1, a

, plurality of palrs of spaced arms projecting from the lower end portion of the stem, and disk cutters 3 rotatably mounted between the arms. Each pair of arms includes an upper arm 5 and a lower arm 4. The arms 4 and f each pair are spaced apart to accommodate a cutter and project beyond the end of the stem and also radially from the stem to support the cutter beyond the end of the stem and to extend or project outwardly from a point close to the central longitudinal axis of the stem. In accordance with our invention the arms 4 and 5, in addition to projecting from the stem in the manner above described, have their outer or cutter carrying portions tilted or diagonally disposed to support the cutter in a pitched or tilted position, as shown in the drawings. In the preferred application of the invention the arms are such as to carry the cutter at an'angle of a proximately 45 degrees with reference to t e bottom of the hole being drilled. In the arrangement shown the cutter 3 is mounted 1927. Serial No. 220,199.

between the arms 4 and 5 by means of a bolt be made sufficiently long so that it can be clamped tight between the'arms by tightening nut 9 on the bolt and still allow the cutter to turn freely.

In the preferred arrangement there are three pairs of arms and, therefore, three outters 3, equally s aced or symmetrically arranged around t e central longitudinal axis of the stem, as clearly shown in Figure 2 of the drawmgs- This symmetrical arrange: ment of the parts causes the bit to be balanced and causes it to remain central in the hole.

In accordance with our invention each cutter 3 has a comparatively thick or wide periphery provided with a central V-shaped groove, leaving or forming two sharp cutting edges 10 and 11. In accordance with our present invention the pitch or angularity of the cutter carrying arms is such that the lower or trailing edge 10 of each cutter disc engages and acts upon the bottom of the hole be ing drilled, clearing the side wall of the hole, while the forward or leading edge 11 clears the bottom of the hole and cuts the sidewall of the hole having more or less of a ream: ing action. The pitch or inclination of the cutter is such that its rear side extends up- Wardly and rearwardly at an oblique angle of about forty-five degrees and the groove is formed in the periphery of the cutter so that the wall joining the lower edge 10 extends upwardly from the lowermost part of the cutter. This relationing of parts at the bottom cutting edge has been found to be very effective. Through the general cutter arrange; ment and action above described the work or cutting is divided between the two edges 10 and 11, thus making the bit particularly efiicient and making the cutters long lived.

The stem 1 is provided at its upper end with. the usual threaded pin 13 for engagement" with the box on the lower end of a drill stem. Further, the stem has a central or axial bore 14 opening downward at the center of the lower end of the stem. This bore 14 is for circulating fluid and, being centrally located, as shown 1n the drawings, directs a jet of circulating fluid downwardly on the innermost sides or parts of the several cutters. The cut- 5 ters being pitched, as above described, at a comparatively great angle, are materially aided in rotation by the jet of circulating .fluid impinging upon their inner parts and, therefore, the circulating fluid facilitates rotation of the cutters as well as keeping the parts free of mud and cuttings.

Having described our invention, we claim: v 1. A drill bit including a stem, a plurality of arms projecting from the lower end por- ,tion of said stem, disk cutters journaled in said arms, ,each cutter being annularly groove'd at its periphery to have a pair'of spaced cutting edges, said arms being angu- 'larly related to the axis of said stem so that zo'o'ne c tting edge off eachccutterwill cut the bottom .of the ,well bore and the other cutedge will cutthe side of the'bore. L A'drill bit including a stem, three or more arms formed on the lower end of said 2a stem andspaced equidistant apart, three or ,moiedisk cutters journaled respectively in -.said,arms, said cutters each being annularly grooved at'itsperiphery to have a pair of I spaced cuttingedges, sald arms being angu- 013,1151 related to the axis of the stem so that one cutt' edge of each cutter will cut the bottom and the other cutting edge Will cut the side of vthe well bore.v u

v 3. A drill bit including a stem, a plurality 5 of arms formed on the lower endof said stem,

.disk cutters journaledin said arms, said cuttersteach being annularly grooved 'atits p'e- ,riphery tohave a pair of spaced cutting edges, said arms being ,augularly related to the axis 40 ofsaidstem so that one cutting edge of each cutter will cut the bottom of the well bore while the-other cutting edge will cut the side of the here, said cutters being of, such diameter and arranged in such manner as to cut a ,coreless :bore. a v

In witness that 7 1e claim the foregoing we have hereunto subscribedour names this 12th day of September, 1927. i p VAN J. KUBIN. PERRY FUNDERBURK. 

